H-Shaped Header Differential Pressure Transducer
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Solution Overview
Problem
Existing low differential pressure transducers face challenges in bringing out leads from semiconductor sensors, resulting in one diaphragm being smaller than the other, which affects the device's operation due to unequal back pressure and compliance, leading to pressure variations.
Innovation Solution
A pressure transducer design featuring an 'H' shaped header with equally sized diaphragms and a channel system that allows leads to be brought out in a semi-circle configuration, ensuring both diaphragms receive equal pressure and are of the same size, maintaining uniform operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If leads are brought out from semiconductor sensors in prior art devices, then the leads can be connected to external circuits, but one diaphragm becomes smaller than the other resulting in unequal back pressure and compliance
Solution Approach 1:
The patent transitions from a linear lead arrangement to a semi-circular configuration in a different spatial dimension. The leads are arranged in a semi-circle on the header's outer surface, allowing all leads to be brought out equidistantly from the sensor without interfering with diaphragm size, thus resolving the contradiction between lead connectivity and diaphragm uniformity
Solution Approach 2:
The header acts as an intermediary component between the semiconductor sensor and external circuits. It provides a semi-circular lead arrangement that mediates the connection process, allowing leads to be accessed without compromising the equal sizing of both diaphragms, thus maintaining manufacturing precision while enabling ease of operation
2Measurement precision
If diaphragms are made larger to reduce back pressure and increase compliance, then pressure measurement accuracy improves, but device complexity increases due to lead arrangement requirements
Solution Approach 1:
By arranging leads in a semi-circular pattern on the header's outer surface rather than in a linear or circular pattern around the periphery, the patent enables larger diaphragms without increasing device complexity. This dimensional reorganization allows both diaphragms to be equally large for improved pressure measurement accuracy while keeping the lead arrangement simple and systematic
3Ease of operation
If two different size diaphragms are used to accommodate lead termination, then leads can be brought out, but pressure variations occur compromising device operation
Solution Approach 1:
The patent introduces asymmetry in the lead arrangement (semi-circular rather than symmetric circular pattern) while maintaining symmetry in diaphragm sizing. This asymmetric lead configuration on the header allows all leads to be brought out equidistantly from the sensor without requiring asymmetric diaphragms, thus enabling easy lead termination while maintaining pressure measurement consistency through equal diaphragm sizes
Solution Approach 2:
The semi-circular lead arrangement in a different spatial dimension allows both diaphragms to be the same size for reliable pressure measurement, while still providing accessible lead termination points on the header's outer surface
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables uniform back pressure and compliance across both diaphragms, improving the operational efficiency of the transducer by allowing leads to be brought out without compromising diaphragm size, thus enhancing the accuracy of differential pressure measurements.
Implementation Method 1
said sensor diaphragm deflects in accordance with the difference in pressure applied to said sides
Implementation Method 2
the piezoresistor devices which are employed on the diaphragm surface are connected together to form a bridge which will provide a differential output
Data Source
AI summary
A pressure transducer has an H-shaped cross-sectional header having a front and a back section. The front and back sections are of equal diameter and are circular. Each front and back section has a depression with an isolation diaphragm covering the depression. Each diaphragm is of equal size and the depressions communicate one with the other via a central channel in the central arm of the H. A pressure sensor communicates with the channel, where the pressure sensor responds to a first pressure applied to the first isolation diaphragm and a second pressure applied to the second isolation diaphragm. The pressure sensor produces an output equal to the difference in pressure. The differential pressure transducer having both diaphragms of the same size and still enabling leads from the sensor to be brought out.